[MARMAM] New publication

machiel oudejans machiel.oudejans at gmail.com
Thu May 7 04:43:25 PDT 2015

Dear all,

On behalf of my co-authors, I'm pleased to announce of a new publication:

Oudejans Machiel G, Visser Fleur, Englund Anneli, Rogan Emer and Ingram
Simon N, (2015)* Evidence for Distinct Coastal and Offshore Communities of
Bottlenose Dolphins in the North East Atlantic*

PLoS ONE 10(4): e0122668. doi:10.1371/journal.pone.0122668

Online open access:

Kind regards,

Machiel Oudejans

Kelp Marine Research
Machiel.oudejans at gmail.com

*Abstract*: Bottlenose dolphin stock structure in the northeast Atlantic
remains poorly understood. However, fine scale photo-id data have shown
that populations can comprise multiple overlapping social communities.
These social communities form structural elements of bottlenose
dolphin (*Tursiops
truncatus*) populations, reflecting specific ecological and behavioural
adaptations to local habitats. We investigated the social structure of
bottlenose dolphins in the waters of northwest Ireland and present evidence
for distinct inshore and offshore social communities. Individuals of the
inshore community had a coastal distribution restricted to waters within 3
km from shore. These animals exhibited a cohesive, fission-fusion social
organisation, with repeated resightings within the research area, within a
larger coastal home range. The offshore community comprised one or more
distinct groups, found significantly further offshore (>4 km) than the
inshore animals. In addition, dorsal fin scarring patterns differed
significantly between inshore and offshore communities with individuals of
the offshore community having more distinctly marked dorsal fins.
Specifically, almost half of the individuals in the offshore community
(48%) had characteristic stereotyped damage to the tip of the dorsal fin,
rarely recorded in the inshore community (7%). We propose that this
characteristic is likely due to interactions with pelagic fisheries. Social
segregation and scarring differences found here indicate that the distinct
communities are likely to be spatially and behaviourally segregated.
Together with recent genetic evidence of distinct offshore and coastal
population structures, this provides evidence for bottlenose dolphin
inshore/offshore community differentiation in the northeast Atlantic. We
recommend that social communities should be considered as fundamental units
for the management and conservation of bottlenose dolphins and their
habitat specialisations.
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